ScienceWiz - Compass (Pack of 3) AWARD WINNING ScienceWiz curriculum is designed to teach kids science in an intuitive and natural progression Build an understanding of the Earth's magnetic fields with this set of compasses from award winning science experiment creator, Science Wiz Each pack includes three 1.5" diameter compasses Perfect for camping trips and learning basic survival skills Intended to be parts for use with science projects, science fairs, etc. and are provided with minimal to no operating instructions